1. A radiate animal, having an opaque, leathery, or crustaceous skin, with tubercles or even movable spines, as the star-fish, seaurchin, &c.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• echinderms,
• chyloderm,
• wchinoderm,
• schinoderm,
• dchinoderm,
• rchinoderm,
• 4chinoderm,
• 3chinoderm,
• exhinoderm,
• evhinoderm,
• efhinoderm,
• edhinoderm,
• ecginoderm,
• ecbinoderm,
• echonoderm,
• echinoiderm,
• echinnoderm,
• echinodurm,
• echinodea,
• echinoide

• echinoidea,
• echinodermata.

The adjective form of the word "echinoderm" is "echinodermatous".

The plural of the "echinoderm" can be the "echinoderms".

The singular of the "echinoderm" can be the "echinoderm".